Match the following terms with their definitions or descriptions

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11 Terms

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Sarcolemma

name given to the plasma membrane of a muscle cell

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T-tubule

inward extensions of the sarcolemma that allow impulses to go deeper into the cell

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Irritability

the ability of a muscle cell to be stimulated or excited

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Motor unit

a neuron and all the muscle fibers it stimulates

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Tropomyosin

protein that blocks the receptor sites on the actin molecule

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Contractility

the ability of a muscle cell to shorten

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Actin

bead-like globular protein that makes up the thin myofilament

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Troponin

protein that joins with calcium ions to allow cross-bridges to form

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Extensibility

the ability of a muscle to stretch

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Myosin

protein that looks like “bundled golf clubs” that makes up the thick myofilament

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Sarcomere

a segment of the myofilament between two Z-lines